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My Rostrata sits in heavy clay, south side of my house. It's been in the ground 11 years. That's included some tough winters. I've been lucky with spear pull. It hasn't happened yet. Nor have I had a big defoliation. Every spring, though, the oldest blades turn brown and I cut those off. It's never a huge amount. Earlier this week, I did it's annual pruning for that.

Mine grows slow. Very slow. But it seems happy. Good color to it. Never looks sick. Isn't bothered by pests or fungal issues.

At the nursery, they were tagged as Zone 5 plants. I think that's only reliable in a dry-winter, western type environment. On the East Coast, you really don't see them very much in zones colder than 6b. Also, in the East, they really do better planted in sandy, fast draining soils. As such, they are much more commonly seen in New Jersey (sandy) than in Delaware or Pennsylvania (clay).